<style>
    canvas { border: solid green; }
</style>
<p>
    These should be four green hollow boxes with dimensions 600x300, 100x300, 600x100, 100x100.
</p>
<canvas width="600" height="300"></canvas>
<canvas width="100" height="300"></canvas>
<canvas width="600" height="100"></canvas>
<canvas width="100" height="100"></canvas>
